This dissertation tries to gain a better understanding of the concept of autarkeia which is present in the writings of Aristotle. Doing this, we are also able to get a clearer idea of the link between ethics and politics in the aristotelian thought. In order to achieve this, we start by distinguishing two types of self-sufficiency : the divine self-sufficiency and the human self-sufficiency. The divine self-sufficiency is to be understood as the fact of being fully self-sufficient in the most rigorous way. Strictly speaking, it is only the divine that can be granted of such a self-sufficiency. On the other hand, the human self-sufficiency is the one effective in the aristotelian definition of the polis, which is the self-sufficient grouping of persons aiming at living and good living. After that, we show that the practice of philosophy, which is described as a self-sufficient activity in NE, X, is hardly possible as an activity of the polis and cannot participate in bringing a polis to life. This is founded in the fact that for Aristotle, it is the needs that keep people together, united in a polis, and considering that, it is difficult to see how philosophy could be part of this, because it is totally useless and searched for itself. However, we try to see how it would be possible to conciliate the practice of philosophy with the necessity for a human to live in a polis, because Aristotle never speaks of it as being problematic. The answer of this so-called problem is to be found in the notion of leisure, by relegating philosophy to this part of a human life in order for it to be practiced. It is also by associating philosophy and leisure that we can draw the link between ethics and politics.